Frequent abdominal pain in 13-year-old girls may be caused by gynecological disorders such as dysmenorrhea, vaginitis and cervicitis. It may also be caused by gastrointestinal diseases, such as gastritis, enteritis, intestinal cramps, inflammation of mesenteric lymph nodes, etc., all of which may cause abdominal pain. If you have frequent abdominal pain, it is recommended that you go to a regular hospital to check whether it is caused by gynecological diseases or digestive tract diseases, so that you can find out the disease and carry out targeted treatment.